function hex_md5 (string) {
  var x = Array()
  var k, AA, BB, CC, DD, a, b, c, d
  var S11 = 7, S12 = 12, S13 = 17, S14 = 22
  var S21 = 5, S22 = 9, S23 = 14, S24 = 20
  var S31 = 4, S32 = 11, S33 = 16, S34 = 23
  var S41 = 6, S42 = 10, S43 = 15, S44 = 21
  string = Utf8Encode(string)
  x = ConvertToWordArray(string)
  a = 0x67452301
  b = 0xEFCDAB89
  c = 0x98BADCFE
  d = 0x10325476
  for (k = 0; k < x.length; k += 16) {
    AA = a
    BB = b
    CC = c
    DD = d
    a = FF(a, b, c, d, x[k + 0], S11, 0xD76AA478)
    d = FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756)
    c = FF(c, d, a, b, x[k + 2], S13, 0x242070DB)
    b = FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE)
    a = FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF)
    d = FF(d, a, b, c, x[k + 5], S12, 0x4787C62A)
    c = FF(c, d, a, b, x[k + 6], S13, 0xA8304613)
    b = FF(b, c, d, a, x[k + 7], S14, 0xFD469501)
    a = FF(a, b, c, d, x[k + 8], S11, 0x698098D8)
    d = FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF)
    c = FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1)
    b = FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE)
    a = FF(a, b, c, d, x[k + 12], S11, 0x6B901122)
    d = FF(d, a, b, c, x[k + 13], S12, 0xFD987193)
    c = FF(c, d, a, b, x[k + 14], S13, 0xA679438E)
    b = FF(b, c, d, a, x[k + 15], S14, 0x49B40821)
    a = GG(a, b, c, d, x[k + 1], S21, 0xF61E2562)
    d = GG(d, a, b, c, x[k + 6], S22, 0xC040B340)
    c = GG(c, d, a, b, x[k + 11], S23, 0x265E5A51)
    b = GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA)
    a = GG(a, b, c, d, x[k + 5], S21, 0xD62F105D)
    d = GG(d, a, b, c, x[k + 10], S22, 0x2441453)
    c = GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681)
    b = GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8)
    a = GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6)
    d = GG(d, a, b, c, x[k + 14], S22, 0xC33707D6)
    c = GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87)
    b = GG(b, c, d, a, x[k + 8], S24, 0x455A14ED)
    a = GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905)
    d = GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8)
    c = GG(c, d, a, b, x[k + 7], S23, 0x676F02D9)
    b = GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A)
    a = HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942)
    d = HH(d, a, b, c, x[k + 8], S32, 0x8771F681)
    c = HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122)
    b = HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C)
    a = HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44)
    d = HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9)
    c = HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60)
    b = HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70)
    a = HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6)
    d = HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA)
    c = HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085)
    b = HH(b, c, d, a, x[k + 6], S34, 0x4881D05)
    a = HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039)
    d = HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5)
    c = HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8)
    b = HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665)
    a = II(a, b, c, d, x[k + 0], S41, 0xF4292244)
    d = II(d, a, b, c, x[k + 7], S42, 0x432AFF97)
    c = II(c, d, a, b, x[k + 14], S43, 0xAB9423A7)
    b = II(b, c, d, a, x[k + 5], S44, 0xFC93A039)
    a = II(a, b, c, d, x[k + 12], S41, 0x655B59C3)
    d = II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92)
    c = II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D)
    b = II(b, c, d, a, x[k + 1], S44, 0x85845DD1)
    a = II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F)
    d = II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0)
    c = II(c, d, a, b, x[k + 6], S43, 0xA3014314)
    b = II(b, c, d, a, x[k + 13], S44, 0x4E0811A1)
    a = II(a, b, c, d, x[k + 4], S41, 0xF7537E82)
    d = II(d, a, b, c, x[k + 11], S42, 0xBD3AF235)
    c = II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB)
    b = II(b, c, d, a, x[k + 9], S44, 0xEB86D391)
    a = AddUnsigned(a, AA)
    b = AddUnsigned(b, BB)
    c = AddUnsigned(c, CC)
    d = AddUnsigned(d, DD)
  }
  var temp = WordToHex(a) + WordToHex(b) + WordToHex(c) + WordToHex(d)
  return temp.toUpperCase()
}

function RotateLeft (lValue, iShiftBits) {
  return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits))
}

function AddUnsigned (lX, lY) {
  var lX4, lY4, lX8, lY8, lResult
  lX8 = (lX & 0x80000000)
  lY8 = (lY & 0x80000000)
  lX4 = (lX & 0x40000000)
  lY4 = (lY & 0x40000000)
  lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF)
  if (lX4 & lY4) {
    return (lResult ^ 0x80000000 ^ lX8 ^ lY8)
  }
  if (lX4 | lY4) {
    if (lResult & 0x40000000) {
      return (lResult ^ 0xC0000000 ^ lX8 ^ lY8)
    } else {
      return (lResult ^ 0x40000000 ^ lX8 ^ lY8)
    }
  } else {
    return (lResult ^ lX8 ^ lY8)
  }
}

function F (x, y, z) {
  return (x & y) | ((~x) & z)
}

function G (x, y, z) {
  return (x & z) | (y & (~z))
}

function H (x, y, z) {
  return (x ^ y ^ z)
}

function I (x, y, z) {
  return (y ^ (x | (~z)))
}

function FF (a, b, c, d, x, s, ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac))
  return AddUnsigned(RotateLeft(a, s), b)
}

function GG (a, b, c, d, x, s, ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac))
  return AddUnsigned(RotateLeft(a, s), b)
}

function HH (a, b, c, d, x, s, ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac))
  return AddUnsigned(RotateLeft(a, s), b)
}

function II (a, b, c, d, x, s, ac) {
  a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac))
  return AddUnsigned(RotateLeft(a, s), b)
}

function ConvertToWordArray (string) {
  var lWordCount
  var lMessageLength = string.length
  var lNumberOfWords_temp1 = lMessageLength + 8
  var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64
  var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16
  var lWordArray = Array(lNumberOfWords - 1)
  var lBytePosition = 0
  var lByteCount = 0
  while (lByteCount < lMessageLength) {
    lWordCount = (lByteCount - (lByteCount % 4)) / 4
    lBytePosition = (lByteCount % 4) * 8
    lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition))
    lByteCount++
  }
  lWordCount = (lByteCount - (lByteCount % 4)) / 4
  lBytePosition = (lByteCount % 4) * 8
  lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition)
  lWordArray[lNumberOfWords - 2] = lMessageLength << 3
  lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29
  return lWordArray
}

function WordToHex (lValue) {
  var WordToHexValue = '', WordToHexValue_temp = '', lByte, lCount
  for (lCount = 0; lCount <= 3; lCount++) {
    lByte = (lValue >>> (lCount * 8)) & 255
    WordToHexValue_temp = '0' + lByte.toString(16)
    WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2)
  }
  return WordToHexValue
}

function Utf8Encode (string) {
  var utftext = ''
  for (var n = 0; n < string.length; n++) {
    var c = string.charCodeAt(n)
    if (c < 128) {
      utftext += String.fromCharCode(c)
    } else if ((c > 127) && (c < 2048)) {
      utftext += String.fromCharCode((c >> 6) | 192)
      utftext += String.fromCharCode((c & 63) | 128)
    } else {
      utftext += String.fromCharCode((c >> 12) | 224)
      utftext += String.fromCharCode(((c >> 6) & 63) | 128)
      utftext += String.fromCharCode((c & 63) | 128)
    }
  }
  return utftext
}

export default hex_md5
